Title

Tailored Synthesis and Optoelectronic Applications of Cu–In–Se Quantum Dots

DGIST Authors

Li Shi ; Jiwoong Yang ; Ju-Hyuck Lee

Advisor

양지웅

Co-Advisor(s)

Ju-Hyuck Lee

Issued Date

2026

Awarded Date

2026-02-01

Type

Thesis

Description

Cu–In–Se quantum dots, Photoelectrochemical hydrogen production, Self-powered/intrinsically-stretchable photodetectors, Wearable health monitoring, Retina-inspired optoelectronics

Table Of Contents

ABSTRACT i
List of Contents iii

Ⅰ. Cu–In–Se Quantum Dot Optoelectronics: Background and Dissertation Overview 1
1.1 Introduction 1
1.2 Overview of Quantum Dots 2
1.2.1 Fundamentals of Quantum Dots 2
1.2.2 Physical Properties of Quantum Dots 2
1.3 Recent Progress in Optoelectronic Applications of Cu–In–Se QDs 8
1.3.1 Overview of Cu–In–Se QDs 8
1.3.2 Colloidal Synthesis of Cu–In–Se QDs 10
1.3.3 Cu–In–Se QDs in PEC Systems 12
1.3.4 Cu–In–Se QDs in Solar Cells 20
1.3.5 Cu–In–Se QDs in Photodetectors 25
1.3.6 Challenges of Cu–In–Se QD-Based Optoelectronic Devices 31
1.4 Dissertation Overview 33
1.5 References 34
Ⅱ. Synthesis and Characterization of Defect-Engineered Cu–In–Se Quantum Dots for Photoelectrochemical Hydrogen Generation and QD-sensitized solar cells 45
2.1 Introduction 45
2.2 Experimental Section 47
2.2.1 Materials 47
2.2.2 Synthesis of defect-engineered CISe QDs 47
2.2.3 Characterization of CISe QDs 48
2.2.4 Preparation and characterization of photoanodes using CISe QDs 50
2.2.5 Evaluation of PEC hydrogen production performance 51
2.2.6. Evaluation of photovoltaic measurements 53
2.3 Result and Discussion 53
2.3.1 Synthesis of CISe QDs with controlled In/Cu ratios 53
2.3.2. Structure characterization of CISe QDs 55
2.3.3. Optical and electrical properties of defect-engineered CISe QDs 58
2.3.4. PEC properties of CISe QDs/TiO2 photoanodes 63
2.4 Conclusion 74
2.5 References 75
Ⅲ. Fabrication of Ultrathin Self-Powered Cu–In–Se Quantum Dot Photodetectors for Wearable Health Monitoring 84
3.1 Introduction 84
3.2 Experimental Section 90
3.2.1 Material 90
3.2.2 Colloidal synthesis of nanomaterials 90
3.2.3 Solid-State ligand exchange processes 91
3.2.4 Characterization of CISe QDs 91
3.2.5 Electrochemical measurements 92
3.2.6 Photodetector fabrication 93
3.2.7 PPG sensor fabrication 94
3.2.8 Device characterization 95
3.2.9 Calculation of photodetector performance 95
3.3 Result and Discussion 97
3.3.1 Preparation of CISe QDs 97
3.3.2 Preparation of PEDOT:PSS:MoS2 Hybrid HTLs 101
3.3.3 Ultrathin CISe QD-PDs 103
3.3.4 Wearable PPG Sensors with CISe QD-PDs 114
3.4 Conclusion 118
3.5 References 119
Ⅳ. Fabrication of Intrinsically-Stretchable Broadband Quantum Dot Photodetectors for Artificial Retinas 128
4.1 Introduction 128
4.2 Experimental Section 132
4.2.1 Synthesis of CISe QDs and ZnO nanoparticles 132
4.2.2 Preparation of stretchable QD-nanocomposites 132
4.2.3 Preparation of stretched QD-nanocomposite films 133
4.2.4 Materials characterization 133
4.2.5 Electrochemical analysis 134
4.2.6 Fabrication of conventional rigid QD-photodiodes 135
4.2.7 Fabrication of intrinsically-stretchable QD-photodiodes 135
4.2.8 Device characterization 136
4.2.9 Performance metrics of photodetector 137
4.2.10 Optical simulations for intrinsically-stretchable QD-photodiode arrays 137
4.3 Result and Discussion 138
4.3.1 Preparation of intrinsically-stretchable QD-nanocomposites 138
4.3.2 QD-photodetectors employing intrinsically-stretchable QD-photoactive layers 146
4.3.3 Extension to intrinsically-stretchable SWIR QD-photodetectors 154
4.3.4 Intrinsically-stretchable QD-photodiode arrays 156
4.3.5 Retina-inspired hemispherical image sensors with dynamically tunable curvature 159
4.4 Conclusion 163
4.5 References 164
요 약 문 172

URI

https://scholar.dgist.ac.kr/handle/20.500.11750/59620
http://dgist.dcollection.net/common/orgView/200000943058

DOI

10.22677/THESIS.200000943058

Degree

Doctor

Department

Department of Energy Science and Engineering

Publisher

DGIST

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